Effect of endosperm starch granule size distribution on milling yield in hard wheat

Edwards, M. A., Osborne, B. G. and Henry, R. J. (2008) Effect of endosperm starch granule size distribution on milling yield in hard wheat. Journal of Cereal Science, 48 1: 180-192.


Author Edwards, M. A.
Osborne, B. G.
Henry, R. J.
Title Effect of endosperm starch granule size distribution on milling yield in hard wheat
Journal name Journal of Cereal Science   Check publisher's open access policy
ISSN 0733-5210
1095-9963
Publication date 2008-07
Sub-type Article (original research)
DOI 10.1016/j.jcs.2007.09.001
Volume 48
Issue 1
Start page 180
End page 192
Total pages 13
Place of publication London, United Kingdom
Publisher Academic Press
Language eng
Formatted abstract Increased flour yield in hard wheat is associated with increased endosperm rheology index, calculated from strength and stiffness as measured by the SKCS. A study of the fractured endosperm of hard wheat varieties grouped according to similar rheology index values was performed using environmental scanning electron microscopy (ESEM). Differing microstructures and fracture patterns were observed between each group. Specifically, the group representing high rheology index had a greater concentration of small starch granules in prismatic cells. Samples of diverse wheat germplasm were grown at two sites and subjected to laboratory milling. Starch granule size distribution (SGSD) analysis using a laser diffraction method was undertaken on a subset of samples in triplicate representing a range in flour yield. The results supported an hypothesis for a significant influence of SGSD on flour yield of hard wheat varieties. In addition, a significant part (R2>0.40 (p<0.05) at two sites) of the association appeared to be under genetic control. Results indicate a more even gradation of distributions involving an increase in the sample volume % of small granule (types B and C) and decrease in type A granules. This was associated with increased rheology index values and higher flour yield. The ratio of type A:C starch granules accounted for up to 58% (p<0.05) of the variation in flour yield in the samples studied. Thus, rheological parameters measured using a rapid SKCS screening method can be linked to the genetic regulation of SGSD with implications for the improvement of commercial processing performance of hard wheat.
Keyword Environmental Scanning Electron Microscopy
Laser Diffraction
Skcs
Starch Granule Size Distribution
Wheat Milling
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
ERA 2012 Admin Only
 
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Created: Mon, 07 Mar 2011, 16:05:45 EST